package key;

import java.io.IOException;
import javax.servlet.Filter;
import javax.servlet.FilterChain;
import javax.servlet.FilterConfig;
import javax.servlet.ServletException;
import javax.servlet.ServletRequest;
import javax.servlet.ServletResponse;
import javax.servlet.annotation.WebFilter;
import javax.servlet.annotation.WebInitParam;

@WebFilter(filterName = "/CFilter",urlPatterns = "/*",initParams = {@WebInitParam(name = "encoding", value = "utf-8")})
public class CFilter implements Filter {//通用型字符过滤器
	
	String encoding = null;
	
    public CFilter() {
    }

	public void destroy() {
		encoding = null;
	}

	public void doFilter(ServletRequest request, ServletResponse response, FilterChain chain) throws IOException, ServletException {
		request.setCharacterEncoding(encoding);
		response.setContentType("text/html; charset="+encoding);
		chain.doFilter(request, response);
	}

	public void init(FilterConfig fConfig) throws ServletException {
		encoding = fConfig.getInitParameter("encoding");
	}

}
